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CVE-2026-98742

UnknownEPSS 0.17%

Last modified

CVE-2026-98742 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Serialize compat port-info ioctls The native sequencer ioctl path serializes handler calls with client->ioctl_mutex, but the translated port-info compat path invokes the same handlers through snd_seq_kernel_client_ctl() without taking that mutex. This lets concurrent compat CREATE_PORT requests pass the port-count check before any request reaches the serialized insertion. The computed integer port index can then exceed the address field range and wrap to an existing index. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Serialize compat port-info ioctls The native sequencer ioctl path serializes handler calls with client->ioctl_mutex, but the translated port-info compat path invokes the same handlers through snd_seq_kernel_client_ctl() without taking that mutex. This lets concurrent compat CREATE_PORT requests pass the port-count check before any request reaches the serialized insertion. The computed integer port index can then exceed the address field range and wrap to an existing index. Subsequent subscriber teardown can resolve the duplicate address to the wrong port and access a freed subscriber. Take ioctl_mutex while dispatching converted port-info requests, matching the native ioctl path. All translated port-info commands share this helper, so their accesses to the client port state are serialized as well.

Metrics

EPSS Probability
0.17%

6.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= b3defb791b26ea0683a93a4f49c77ec45ec96f10, < 14e178c60ba1cea49186fcfccac93d66aa94e9e0; >= b3defb791b26ea0683a93a4f49c77ec45ec96f10, < 4980768c5d092493be0deb20d1ee86aa661466f8; >= b3defb791b26ea0683a93a4f49c77ec45ec96f10, < 2c0cce3a5a660270d65729b0f318d4e01470479d; >= b3defb791b26ea0683a93a4f49c77ec45ec96f10, < 2db234e163f0d211b69a4eebbec8aacc5a54a80e; >= b3defb791b26ea0683a93a4f49c77ec45ec96f10, < 413211dd31cb2ef2fc99fb0aa1a037a97509502c; >= b3defb791b26ea0683a93a4f49c77ec45ec96f10, < fc5c52848e405b6efb073db5035bb9ebaed11ec4; >= b3defb791b26ea0683a93a4f49c77ec45ec96f10, < 702d92f361f65d9698c473c7599d471395dc4341; >= b3defb791b26ea0683a93a4f49c77ec45ec96f10, < 95b2e0361c88753afa030c10698be0a1a5b67650; d6693160906d55ba376bf0b88b7c129762170162; 02cbce8576a31df8fca54aaec91ee081076bd79d; 6aab3aa52366a0051e5abf8aae4616c42053fd8e; f8a38ab4cd9624fc5ac8a7f965c7b20f5b62c03c; 623e5c8ae32b39cc8baea83478695dc624935318; e4ff9f294629b65df3f7982cd4faf86b2856b9d7; c3162384aed4cfe3f1a1f40041f3ba8cd7704d88; >= 3.2.99, < 3.3; >= 3.16.54, < 3.17; >= 3.18.94, < 3.19; >= 4.1.50, < 4.2; >= 4.4.115, < 4.5; >= 4.9.78, < 4.10; >= 4.14.15, < 4.15
LinuxLinux4.15

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98742?
In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Serialize compat port-info ioctls The native sequencer ioctl path serializes handler calls with client->ioctl_mutex, but the translated port-info compat path invokes the same handlers through snd_seq_kernel_client_ctl() without taking that mutex. This lets concurrent compat CREATE_PORT requests pass the port-count check before any request reaches the serialized insertion. The computed integer port index can then exceed the address field range and wrap to an existing index. Subsequent subscriber teardown can resolve the duplicate address to the wrong port and access a freed subscriber. Take ioctl_mutex while dispatching converted port-info requests, matching the native ioctl path. All translated port-info commands share this helper, so their accesses to the client port state are serialized as well.
How severe is CVE-2026-98742?
Severity scoring for CVE-2026-98742 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98742?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST